* doc/ref/api-data.texi (Characters): Documentation for `char-titlecase'.
* doc/ref/api-i18n.texi (Character Case Mapping): Documentation for
`char-locale-titlecase' and `string-locale-titlecase'.
* libguile/chars.c, libguile/chars.h (scm_char_titlecase, scm_c_titlecase): New
functions.
* libguile/i18n.c, libguile/i18n.h (chr_to_case, scm_char_locale_titlecase,
str_to_case, scm_string_locale_titlecase): New functions.
* libguile/i18n.c (scm_char_locale_downcase, scm_char_locale_upcase,
scm_string_locale_downcase, scm_string_locale_upcase): Refactor to share code
via chr_to_case and str_to_case, as appropriate.
* module/ice-9/i18n.scm (char-locale-title-case, string-locale-titlecase): New
functions.
* libguile/srfi-13.c (string_titlecase_x): Use uc_totitle instead of uc_toupper.
* test-suite/tests/chars.test: Tests for `char-titlecase'.
* test-suite/tests/i18n.test: Tests for `char-locale-titlecase' and
`string-locale-titlecase'.
* test-suite/tests/srfi-13.test: Tests for `string-titlecase'.
* posix.c (scm_init_posix): Add LC_PAPER, LC_NAME, LC_ADDRESS,
LC_TELEPHONE, LC_MEASUREMENT, LC_IDENTIFICATION.
* i18n.c (scm_i_to_lc_category): New name and export. Support all
LC categories.
* posix.c (s_scm_setlocale): Use it.
* i18n.h, i18n.c (scm_textdomain, scm_bindtextdomain,
scm_bind_textdomain_codeset): Make wrappers similar to C function
they wrap.
* i18n.h: New file.
* i18n.c: New file.
* gettext.h: New file, taken from GNU gettext.
* init.c: Include libguile/i18n.h.
(scm_init_guile_1): Add call to scm_init_i18n().
* Makefile.am (libguile_la_SOURCES): Add i18n.c.
(DOT_X_FILES): Add i18n.x.
(DOT_DOC_FILES): Add i18n.doc.
(libguile_la_LDFLAGS): Add @LTLIBINTL@.
(modinclude_HEADERS): Add i18n.h.